Hello @kierian,
After recreating the connector a dozen times with no luck it decided to start working today! I am still have issues getting it to connect to my on premise API, but at least I am getting actual error messages now.
After having the issues of the connector not even making a query, I am not sure if I am doing something incorrectly or if it is correct and for whatever reason the custom connector platform is just giving issues.
I have this POST that I can reach fine internally, but I receive error messages 404 and 500 when clicking "Test operation".
The POST:
http://<localhost>:80/Integration/BarTenderTest/Execute
What is the proper way to make this query on the custom connector platform? For the host do I just list the local ip address and port? Would the base URL be /Integration/BarTenderTest ?

For the Definition POST request, would the url just be /Execute ?
